Robert Caro has spent 38 years writing the biography of one man. The fourth volume of that work, like its three predecessors a giant achievement and certain bestseller, is about to be published. But Caro is not done.

He was a proud Marine who survived three brutal tours in Iraq and had plans to redeploy with the National Guard. But when 30-year-old Noah Pippin vanished inside Montana’s remote Bob Marshall Wilderness, he left behind a trail of haunting secrets—and a mystery that may never be solved.

For years before they caught him, the Italian police had no idea that Paolo Di Lauro was one of Naples’s most powerful crime bosses, running a drug and counterfeit-goods empire—and responsible for a peace his turf had rarely known. Now they long for the days when he was in charge.